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@erain erain commented Jan 2, 2026

This commit addresses a memory leak issue and unbounded cache growth in the kubernetes filter plugin.

Changes:

  • Add kube_meta_cache_size configuration option. This allows users to configure the size of the metadata cache hash table.
  • Update kube_conf.c to use the configured cache size for initialization.
  • Fix memory leak in kube_meta.c where tmp_hash_meta_buf was not freed if flb_hash_table_add failed in flb_kube_pod_meta_get and flb_kube_namespace_meta_get.

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Testing
Before we can approve your change; please submit the following in a comment:

  • Example configuration file for the change
  • Debug log output from testing the change
  • Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

  • Run local packaging test showing all targets (including any new ones) build.
  • Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

  • Documentation required for this feature

Backporting

  • Backport to latest stable release.

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

This commit addresses a memory leak issue and unbounded cache growth in
the kubernetes filter plugin.

Changes:
- Add `kube_meta_cache_size` configuration option. This allows users to
  configure the size of the metadata cache hash table.
- Update `kube_conf.c` to use the configured cache size for initialization.
- Fix memory leak in `kube_meta.c` where `tmp_hash_meta_buf` was not
  freed if `flb_hash_table_add` failed in `flb_kube_pod_meta_get` and
  `flb_kube_namespace_meta_get`.
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2 participants